:root {
  --ink: #090c0e;
  --ink-soft: #101517;
  --paper: #f1f1eb;
  --paper-deep: #e5e6df;
  --text: #f2f3ed;
  --muted: #a6adaf;
  --ink-muted: #596164;
  --line: #2c3336;
  --paper-line: #c8cbc4;
  --acid: #c8ff18;
  --cyan: #83d9ff;
  --max: 1320px;
  --gutter: clamp(1.25rem, 4vw, 3.75rem);
  --sans: "Manrope", Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Consolas, monospace;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

body.menu-open { overflow: hidden; }

::selection {
  color: var(--ink);
  background: var(--acid);
}

a { color: inherit; }
button { font: inherit; }
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3, h4, p, blockquote { margin-top: 0; }

.shell {
  width: min(100%, var(--max));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 0.5rem;
  left: 0.5rem;
  padding: 0.7rem 1rem;
  color: var(--ink);
  background: var(--acid);
  transform: translateY(-150%);
}

.skip-link:focus { transform: translateY(0); }

.reading-progress {
  position: fixed;
  z-index: 220;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  pointer-events: none;
}

.reading-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--acid);
}

.site-header {
  position: sticky;
  z-index: 200;
  top: 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.13);
  background: rgba(9, 12, 14, 0.92);
  backdrop-filter: blur(16px);
}

.header-inner {
  width: min(100%, var(--max));
  min-height: 4.6rem;
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  white-space: nowrap;
  text-decoration: none;
}

.brand-mark {
  width: 0.55rem;
  height: 0.55rem;
  background: var(--acid);
}

.brand strong {
  font-size: 0.85rem;
  letter-spacing: 0.12em;
}

.brand > span:last-child {
  color: #70787b;
  font: 0.64rem var(--mono);
  letter-spacing: 0.2em;
}

.header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 0.1rem;
}

.primary-nav a {
  padding: 0.55rem 0.6rem;
  color: var(--muted);
  font-size: 0.76rem;
  text-decoration: none;
  transition: color 160ms ease;
}

.primary-nav a:hover,
.primary-nav a:focus-visible,
.primary-nav a.is-active { color: var(--text); }

.language-switch {
  flex: 0 0 auto;
  padding: 0.18rem;
  border: 1px solid var(--line);
  display: inline-flex;
  align-items: center;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.025);
  font: 500 0.63rem/1 var(--mono);
  letter-spacing: 0.06em;
}

.language-switch a,
.language-switch span {
  min-width: 2rem;
  padding: 0.46rem 0.48rem;
  display: grid;
  place-items: center;
  text-decoration: none;
}

.language-switch a:hover,
.language-switch a:focus-visible { color: var(--text); }

.language-switch [aria-current="page"] {
  color: var(--ink);
  background: var(--acid);
}

.menu-toggle {
  display: none;
  padding: 0.5rem 0;
  border: 0;
  color: var(--text);
  background: transparent;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
}

.menu-toggle i,
.menu-toggle i::before {
  display: block;
  width: 1.25rem;
  height: 1px;
  background: currentColor;
  content: "";
  transition: transform 180ms ease;
}

.menu-toggle i::before { transform: translateY(0.34rem); }
.menu-toggle[aria-expanded="true"] i { transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] i::before { transform: rotate(-90deg); }

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  position: absolute;
  inset: 0;
  opacity: 0.7;
  pointer-events: none;
  background-image: linear-gradient(to right, transparent calc(100% - 1px), rgba(255,255,255,0.06) 1px);
  background-size: 20% 100%;
}

.hero-inner {
  position: relative;
  min-height: min(880px, calc(100svh - 4.6rem));
  padding-top: clamp(5rem, 10vw, 8.5rem);
  padding-bottom: clamp(4rem, 8vw, 6.5rem);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: clamp(4rem, 8vw, 7rem);
}

.eyebrow,
.chapter-index,
.micro-label,
.story-marker,
.paper-kicker,
.source-note > span,
.early-book span,
.assessment-shift span {
  font: 500 0.68rem/1.5 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow {
  margin-bottom: 1.6rem;
  color: var(--muted);
}

.eyebrow span {
  margin-right: 1rem;
  color: var(--acid);
}

.hero h1 {
  max-width: 13.2ch;
  margin-bottom: 0;
  font-size: clamp(3.8rem, 7.7vw, 7.6rem);
  font-weight: 600;
  line-height: 0.98;
  letter-spacing: -0.06em;
}

.hero h1 em {
  color: var(--acid);
  font-style: normal;
}

.hero-bottom {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(17rem, 21rem);
  align-items: end;
  gap: clamp(3rem, 9vw, 9rem);
}

.hero-lead {
  max-width: 48rem;
  margin-bottom: 0;
  font-size: clamp(1.15rem, 2vw, 1.65rem);
  line-height: 1.6;
}

.signature {
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 0.4rem;
}

.signature strong { font-size: 0.84rem; }
.signature span { color: #7f878a; font: 0.65rem/1.7 var(--mono); }

.chapter-light {
  color: var(--ink);
  background: var(--paper);
}

.opening,
.paper-chapter,
.book-section,
.sources {
  padding-block: clamp(6rem, 12vw, 11rem);
}

.reading-layout {
  display: grid;
  grid-template-columns: minmax(10rem, 15rem) minmax(0, 48rem);
  justify-content: space-between;
  gap: clamp(3rem, 9vw, 10rem);
}

.chapter-side {
  align-self: start;
  position: sticky;
  top: 7rem;
}

.chapter-index {
  margin-bottom: 1.5rem;
  color: var(--ink-muted);
}

.dark-side .chapter-index { color: #768084; }

.side-note,
.paper-kicker {
  max-width: 13rem;
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.82rem;
  line-height: 1.7;
}

.dark-side .paper-kicker { color: #7f898c; }
.dark-side .side-note { color: #7f898c; }

.prose {
  width: 100%;
  color: var(--ink);
}

.dark-prose { color: var(--text); }

.prose h2 {
  margin-bottom: 2.2rem;
  font-size: clamp(2.65rem, 5.2vw, 5.1rem);
  line-height: 1.04;
  letter-spacing: -0.05em;
  text-wrap: balance;
}

.prose h2 cite { font-style: normal; }

.prose h3 {
  margin: clamp(3.5rem, 7vw, 6.5rem) 0 1.4rem;
  font-size: clamp(1.75rem, 3.2vw, 2.8rem);
  line-height: 1.17;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.prose h4 {
  margin-bottom: 0.65rem;
  font-size: 1.1rem;
  line-height: 1.35;
}

.prose > p {
  max-width: 43rem;
  margin-bottom: 1.65rem;
  color: #3f494c;
  font-size: clamp(1rem, 1.35vw, 1.12rem);
  line-height: 1.85;
}

.dark-prose > p { color: #b5bbbd; }

.prose .standfirst {
  max-width: 46rem;
  margin-bottom: 2.3rem;
  color: var(--ink);
  font-size: clamp(1.28rem, 2.2vw, 1.7rem);
  line-height: 1.6;
  letter-spacing: -0.018em;
}

.dark-prose .standfirst { color: var(--text); }

.human-line {
  margin-block: clamp(3rem, 6vw, 5rem) !important;
  padding-left: 1.6rem;
  border-left: 3px solid var(--acid);
  color: var(--ink) !important;
  font-size: clamp(1.5rem, 2.9vw, 2.35rem) !important;
  line-height: 1.45 !important;
  letter-spacing: -0.03em;
}

.human-line.on-dark { color: var(--text) !important; }

.early-book {
  margin: clamp(3rem, 6vw, 5rem) 0;
  padding-block: 1.3rem;
  border-top: 1px solid var(--paper-line);
  border-bottom: 1px solid var(--paper-line);
  display: grid;
  grid-template-columns: 9rem 1fr;
  align-items: center;
  gap: 2rem;
}

.early-book img {
  width: 9rem;
  height: auto;
  object-fit: contain;
  object-position: center;
}

.early-book p { margin: 0; color: var(--ink-muted); }
.early-book span { display: block; margin-bottom: 0.4rem; color: var(--ink-muted); }
.early-book strong { display: block; margin-bottom: 0.4rem; color: var(--ink); font-size: 1.25rem; }

.source-note {
  margin-top: clamp(4rem, 8vw, 7rem);
  padding: 2rem 0 0 1.6rem;
  border-top: 1px solid var(--paper-line);
  border-left: 3px solid var(--acid);
}

.source-note > span { display: block; margin-bottom: 0.75rem; color: var(--ink-muted); }
.source-note p { max-width: 40rem; margin-bottom: 1rem; color: var(--ink-muted); font-size: 0.92rem; }
.source-note a { color: var(--ink); font: 500 0.7rem var(--mono); text-transform: uppercase; text-decoration: none; }

.paper-chapter { border-top: 1px solid var(--line); }
.chapter-light.paper-chapter { border-top-color: var(--paper-line); }
.story-marker { margin-bottom: 1.3rem; color: var(--cyan); }
.chapter-light .story-marker { color: #146d90; }

.epvl-return {
  margin: clamp(4rem, 8vw, 7rem) 0;
  padding: clamp(2rem, 5vw, 4rem);
  color: var(--ink);
  background: var(--acid);
}

.epvl-return.on-light {
  color: var(--text);
  background: var(--ink);
}

.epvl-return .micro-label { margin-bottom: 2rem; }
.epvl-return.on-light .micro-label { color: var(--acid); }
.epvl-return h3 { max-width: 16ch; margin: 0 0 1.4rem; font-size: clamp(1.8rem, 3.5vw, 3.1rem); }
.epvl-return p:last-child { max-width: 40rem; margin: 0; font-size: 1rem; line-height: 1.8; }

.paper-link-row {
  padding-block: 1.3rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font: 500 0.68rem var(--mono);
  text-transform: uppercase;
}

.chapter-light .paper-link-row { border-color: var(--paper-line); }
.paper-link-row a { color: var(--acid); text-decoration: none; }
.paper-link-row span { color: #758084; }
.paper-link-row.dark-links a { color: #146d90; }

.next-question {
  max-width: 43rem;
  margin: clamp(4.5rem, 9vw, 8rem) 0 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
  color: var(--text);
  font-size: clamp(1.45rem, 2.8vw, 2.25rem);
  line-height: 1.45;
  letter-spacing: -0.028em;
}

.next-question.on-light-next {
  border-top-color: var(--paper-line);
  color: var(--ink);
}

.research-trace {
  margin-top: 2rem;
  padding: 1.35rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: grid;
  gap: 0.45rem;
}

.research-trace > span {
  color: #778185;
  font: 500 0.65rem/1.5 var(--mono);
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.research-trace strong {
  max-width: 42rem;
  color: var(--text);
  font-size: 0.98rem;
  line-height: 1.45;
  font-weight: 600;
}

.research-trace a {
  width: fit-content;
  color: var(--acid);
  font: 500 0.68rem/1.6 var(--mono);
  text-decoration: none;
}

.research-trace.on-light-trace {
  border-color: var(--paper-line);
}

.research-trace.on-light-trace > span { color: var(--ink-muted); }
.research-trace.on-light-trace strong { color: var(--ink); }
.research-trace.on-light-trace a { color: #146d90; }

.institution-links {
  margin-top: 1.1rem;
  display: flex;
  gap: 0.6rem 1.4rem;
  flex-wrap: wrap;
}

.institution-links a {
  color: var(--muted);
  font: 0.66rem var(--mono);
  text-transform: uppercase;
  text-decoration: none;
}

.voice-interlude {
  color: var(--ink);
  background: var(--acid);
}

.voice-inner { padding-top: clamp(4.5rem, 9vw, 8rem); padding-bottom: clamp(4.5rem, 9vw, 8rem); }
.voice-inner .micro-label { margin-bottom: 2.2rem; }
.voice-inner blockquote {
  max-width: 18ch;
  margin-bottom: 2rem;
  font-size: clamp(2.6rem, 6vw, 6rem);
  font-weight: 600;
  line-height: 1.06;
  letter-spacing: -0.055em;
}
.voice-inner > p:not(.micro-label) { max-width: 43rem; margin-bottom: 2rem; font-size: clamp(1.1rem, 2vw, 1.45rem); }
.voice-inner a { font: 500 0.7rem var(--mono); text-transform: uppercase; text-decoration: none; }

.decision-questions {
  margin-top: clamp(4rem, 8vw, 7rem);
  border-top: 1px solid var(--line);
}

.decision-questions p {
  margin: 0;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--text);
  font-size: clamp(1rem, 1.7vw, 1.25rem);
}

.visibility-scale {
  margin-top: clamp(4rem, 8vw, 7rem);
  border-top: 1px solid var(--paper-line);
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.visibility-scale div { min-height: 16rem; padding: 1.4rem; border-right: 1px solid var(--paper-line); display: flex; flex-direction: column; justify-content: flex-end; }
.visibility-scale div:last-child { border-right: 0; }
.visibility-scale span { margin-bottom: auto; color: var(--ink-muted); font: 0.67rem var(--mono); text-transform: uppercase; }
.visibility-scale strong { margin-bottom: 0.6rem; font-size: 1.25rem; }
.visibility-scale p { margin: 0; color: var(--ink-muted); font-size: 0.9rem; }

.four-lenses {
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.four-lenses section { min-height: 17rem; padding: 1.5rem; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); display: flex; flex-direction: column; }
.four-lenses section:nth-child(2n) { border-right: 0; }
.four-lenses span { color: var(--cyan); font: 0.68rem var(--mono); }
.four-lenses h4 { margin-top: auto; color: var(--text); }
.four-lenses p { margin: 0; color: var(--muted); font-size: 0.88rem; }

.epvl-flow {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.epvl-flow li {
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1rem;
}

.epvl-flow li > span { color: var(--cyan); font: 0.68rem var(--mono); }
.epvl-flow strong { display: block; margin-bottom: 0.35rem; font-size: 1.08rem; }
.epvl-flow p { max-width: 38rem; margin: 0; color: var(--muted); }

.evidence-box {
  margin: clamp(4rem, 8vw, 7rem) 0;
  padding: clamp(2rem, 4vw, 3.3rem);
  border: 1px solid var(--line);
  background: var(--ink-soft);
}

.evidence-box .micro-label { margin-bottom: 1.2rem; color: var(--cyan); }
.evidence-box p:last-child { max-width: 40rem; margin: 0; font-size: clamp(1.15rem, 2vw, 1.5rem); line-height: 1.65; }

.assessment-shift {
  margin: clamp(4rem, 8vw, 7rem) 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.assessment-shift div { min-height: 16rem; padding: 1.6rem; border: 1px solid var(--paper-line); display: flex; flex-direction: column; justify-content: flex-end; }
.assessment-shift div:last-child { border-left: 0; color: var(--ink); background: var(--acid); }
.assessment-shift span { margin-bottom: auto; color: var(--ink-muted); }
.assessment-shift p { margin: 0; font-size: 1rem; }

.ai-levels { border-top: 1px solid var(--paper-line); }
.ai-levels p { margin: 0; padding: 1.15rem 0; border-bottom: 1px solid var(--paper-line); display: grid; grid-template-columns: 4.5rem 1fr; gap: 1rem; }
.ai-levels span { color: #146d90; font: 0.68rem var(--mono); }
.ai-levels strong { font-size: 0.96rem; font-weight: 500; }

.book-section {
  color: var(--ink);
  background: var(--acid);
}

.book-layout {
  display: grid;
  grid-template-columns: minmax(16rem, 0.78fr) minmax(0, 1fr);
  align-items: start;
  gap: clamp(3rem, 9vw, 9rem);
}

.book-cover-wrap {
  position: sticky;
  top: 7rem;
  padding: 1.5rem;
  background: var(--ink);
}

.book-cover-wrap img {
  width: 100%;
  height: auto;
  object-fit: contain;
  object-position: center;
}

.book-content .chapter-index { color: rgba(9,12,14,0.62); }
.book-content h2 {
  margin-bottom: 2rem;
  font-size: clamp(2.7rem, 5.5vw, 5.4rem);
  line-height: 1.04;
  letter-spacing: -0.052em;
}

.book-content > p { max-width: 43rem; font-size: 1.05rem; }
.book-content .standfirst { font-size: clamp(1.25rem, 2.2vw, 1.65rem); line-height: 1.6; }

.book-rules { margin-block: clamp(3rem, 6vw, 5rem); border-top: 1px solid rgba(9,12,14,0.3); }
.book-rules p { margin: 0; padding: 1.15rem 0; border-bottom: 1px solid rgba(9,12,14,0.3); display: grid; grid-template-columns: 3.5rem 1fr; gap: 1rem; }
.book-rules span { font: 0.68rem var(--mono); }

.book-line { margin: clamp(3rem, 6vw, 5rem) 0 !important; color: var(--ink) !important; }

.primary-link {
  display: inline-block;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid currentColor;
  font-weight: 600;
  text-decoration: none;
}

.final-position {
  color: var(--text);
  background: var(--ink);
}

.final-inner { padding-top: clamp(6rem, 13vw, 12rem); padding-bottom: clamp(6rem, 13vw, 12rem); }
.final-inner .micro-label { margin-bottom: clamp(3rem, 7vw, 6rem); color: var(--acid); }
.final-inner h2 { max-width: 19ch; margin-bottom: 2.5rem; font-size: clamp(2.8rem, 6.4vw, 6.4rem); line-height: 1.05; letter-spacing: -0.055em; }
.final-inner > p:not(.micro-label) { max-width: 46rem; margin-bottom: 3rem; color: var(--muted); font-size: clamp(1.2rem, 2vw, 1.55rem); }
.final-inner a { color: var(--acid); font: 500 0.7rem var(--mono); text-transform: uppercase; text-decoration: none; }

.sources {
  border-top: 1px solid var(--paper-line);
  color: var(--ink);
  background: var(--paper);
}

.sources-layout { display: grid; grid-template-columns: 0.7fr 1fr; gap: clamp(3rem, 9vw, 9rem); }
.sources-layout h2 { max-width: 12ch; font-size: clamp(2rem, 3.8vw, 3.5rem); line-height: 1.12; letter-spacing: -0.04em; }
.sources-list { border-top: 1px solid var(--paper-line); }
.sources-list a { min-height: 4.8rem; padding: 1rem 0; border-bottom: 1px solid var(--paper-line); display: grid; grid-template-columns: 3.5rem 1fr; align-items: center; gap: 1rem; color: var(--ink-muted); text-decoration: none; }
.sources-list a:hover { color: var(--ink); }
.sources-list span { font: 0.68rem var(--mono); }

.site-footer { background: var(--ink); }
.footer-inner { min-height: 6rem; border-top: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 1rem; color: #788083; font: 0.65rem var(--mono); text-transform: uppercase; letter-spacing: 0.08em; }

@media (max-width: 1100px) {
  .menu-toggle { display: inline-flex; }

  .header-actions { gap: 1rem; }

  .primary-nav {
    position: fixed;
    top: 4.6rem;
    left: 0;
    right: 0;
    height: calc(100svh - 4.6rem);
    padding: 1.5rem var(--gutter) 4rem;
    background: var(--ink);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    overflow-y: auto;
    visibility: hidden;
    opacity: 0;
    transform: translateY(-0.5rem);
    transition: opacity 160ms ease, transform 160ms ease, visibility 160ms;
  }

  .primary-nav.is-open { visibility: visible; opacity: 1; transform: translateY(0); }
  .primary-nav a { padding: 0.8rem 0; border-bottom: 1px solid var(--line); color: var(--text); font-size: 1.08rem; }
}

@media (max-width: 850px) {
  .hero-inner { min-height: auto; }
  .hero h1 { max-width: 15ch; font-size: clamp(3.3rem, 10vw, 5.8rem); }
  .hero-bottom { grid-template-columns: 1fr; }
  .hero-lead { max-width: 42rem; }
  .signature { max-width: 22rem; }

  .reading-layout,
  .book-layout,
  .sources-layout { grid-template-columns: 1fr; }

  .reading-layout { gap: 2rem; }
  .chapter-side,
  .book-cover-wrap { position: static; }
  .side-note,
  .paper-kicker { max-width: 30rem; }
  .chapter-side { padding-bottom: 1.4rem; border-bottom: 1px solid currentColor; }
  .chapter-light .chapter-side { border-bottom-color: var(--paper-line); }
  .paper-chapter:not(.chapter-light) .chapter-side { border-bottom-color: var(--line); }

  .book-cover-wrap { max-width: 27rem; }
}

@media (max-width: 620px) {
  html { scroll-padding-top: 4.5rem; }
  .header-inner { min-height: 4.25rem; }
  .primary-nav { top: 4.25rem; height: calc(100svh - 4.25rem); }
  .brand > span:last-child { display: none; }
  .header-actions { gap: 0.75rem; }
  .language-switch a,
  .language-switch span { min-width: 1.75rem; padding: 0.42rem 0.38rem; }
  .hero-grid { background-size: 50% 100%; }
  .hero-inner { padding-top: 4.5rem; padding-bottom: 4.5rem; gap: 4rem; }
  .hero h1 { font-size: clamp(2.95rem, 13.7vw, 4.8rem); }
  .hero-lead { font-size: 1.08rem; }

  .prose h2,
  .book-content h2 { font-size: clamp(2.3rem, 10.5vw, 3.8rem); }
  .prose h3 { font-size: 1.75rem; }
  .prose > p { line-height: 1.78; }
  .prose .standfirst { font-size: 1.2rem; }

  .early-book { grid-template-columns: 6.5rem 1fr; gap: 1.2rem; }
  .early-book img { width: 6.5rem; }

  .epvl-return { margin-inline: calc(var(--gutter) * -1); padding-inline: var(--gutter); }
  .paper-link-row { align-items: flex-start; flex-direction: column; }

  .voice-inner blockquote { font-size: clamp(2.4rem, 12vw, 4rem); }

  .visibility-scale,
  .four-lenses,
  .assessment-shift { grid-template-columns: 1fr; }
  .visibility-scale div { min-height: 12rem; border-right: 0; border-bottom: 1px solid var(--paper-line); }
  .visibility-scale div:last-child { border-bottom: 0; }
  .four-lenses section { min-height: 13rem; border-right: 0; }
  .assessment-shift div { min-height: 12rem; }
  .assessment-shift div:last-child { border-left: 1px solid var(--paper-line); border-top: 0; }

  .epvl-flow li,
  .ai-levels p { grid-template-columns: 3.2rem 1fr; }
  .book-cover-wrap { max-width: 20rem; }
  .final-inner h2 { font-size: clamp(2.55rem, 12vw, 4.2rem); }
  .footer-inner { padding-block: 1.5rem; align-items: flex-start; flex-direction: column; justify-content: center; }
}

@media (max-width: 390px) {
  :root { --gutter: 1rem; }
  .hero h1 { font-size: 2.8rem; }
  .early-book { grid-template-columns: 1fr; }
  .early-book img { width: 8rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}